Torsion balance



Sept. 27, 1938. REEH 2,131,357

TORSION BALANCE Filed Jun 30, 1937 Patented Sept. 27, 1938 TORSIONBALANCE Erich Reeh, Hanover, Germany Application June 30, 1937, SerialNo. 151,120 In Germany August 13, 1935 5 Claims.

This invention relates to improvements in torsion balances, moreespecially in connection with the pendants of such balances.

In the casings of the usual torsion balances special movable members aremounted by means of which the pendant is lifted to a position in whichit is secured against motion in relation to the casing.

The motion of these members requires further wearisome devices, becausethe members engaging the pendant must be operated simultaneously anduniformly in order to avoid undesired stresses of the most sensibletorsion balance.

When the torsion balance is to be taken into pieces, for instance, forcleaning purposes, these different members render the disconnection andthe remounting of the balance very difficult.

According to this invention either the casing, or (if the casing iscomposed of several boxes or frames) the boxes or frames are maderemovable with relation to the other part of the balance, and membersare attached to the stationary part of the balance holding the pendantfast in its position when, as a result of the mutual displacement of thecasing and the balance, the pendant has advanced so far as to touch thecasing.

The invention is illustrated by way of example in the annexed drawing ofwhich Fig. 1 represents a Vertical cross-section of the frame, thecasing and that part of the balance, in which the pendant is mounted.Fig. 2 is a cross-section of the casing on the line AB of Fig. 1. Fig. 3is a fractional cross-section similar to Fig. 1, showing the balance inthe position in which the pendant is secured against motion. Fig. 4 is aside elevation with part of the frame in vertical crosssection.

In the figures, d is the casing and b the pendant. c is a cylindrichollow body firmly fixed to the balance in which body the casing a isprepared to slide. (1, d are the pins for holding the pendant, whichpins may be guided by the casing. e are springs by which the pressure ofthe pins d on the beam is softened. 1 is the bottom of the casing a. gis a pinion operated by hand with the lever i and meshing with a rack hattached to the casing a. The pinion g is journaled in bearings fixed tothe frame It carrying slide bars I operating with slide faces m providedon the casing a.

When the balance is to be brought from the position shown in Fig. 1 intothat shown in Fig. 3, the casing a. is shifted upwards in the cylindrichollow body 0 until the bar b rests on the bottom 1 of the casing. Bythis displacement the pins (1, cl have entered the chamber ofoscillation, as they have not participated in the displacement, and thusthe pins come into contact with the bar I) so that the pendant issecured against motion in the casing a. The degree of the displacementmay be determined by abutments provided upon the casing or the cylindricbody 0 corresponding to the two end positions of the movable part.

Preferably the arrangement may be such that on lifting the casing a thebottom 1 of the casing comes into contact with the'beam b (see Fig. 3)before the pin (1 touches the bar I). Hereby I attain that on thelowering of the casing a the bar 12 is already released from the pins dwhen the bottom of the casing is detached from the bar b whereby thesudden shock is avoided to which otherwise the pendant would besubjected when unlocking the balance, which shock could tear the torsionfilament.

The insertion of the springs e, e prevents dam-.

aging the beam by too hard a stroke of the pins d and permits of a fine.play when fixing the beam Without its being damaged or without a slightmobility of the beam being retained.

I claim:

1. In a torsion balance, a frame, a hollow body attached to this frame,a casing vertically displaceable in the hollow body, a beam in thecasing, a filament fixed with one end to the hollow body and with theother end to the beam in such a manner that the beam is freely suspendedin the one end position of the casing and in the other end position issupported by the wall of the casing.

35 2. In a torsion balance, a frame, a hollow body attached to thisframe, a casing vertically displaceable in the hollow body, a beam inthe casing, a filament fixed with one end to the hollow body and withthe other end to the beam in such a manner that the beam is freelysuspended in the one end position of the casing and in the other endposition is connected with the casing by clamping.

3. In a torsion balance, a frame, a hollow body fixed to the frame, acasing vertically adjustable in the said body, a beam in the casing, afilament fixed with one end to the hollow body and with the other to thebeam, and pins penetrating'the wall of the casing and reacting againstsaid frame upon vertical adjustment of said casing to clampingly, engagethe beam.

4. In a torsion balance, a frame, a hollow body fixed to the frame, acasing vertically adjustable in the said body, a beam in the casing, afilament 55 carrying the beam in slanting position, and pins penetratingthe wall ofthe casing and reacting against said frame upon verticaladjustment of said casing to clampingly engage the beam, the

distance between the bottom of the casing and 5 the lower end of thebeam being smaller than the distance between the ends of the pins andthe beam.

ERICH REEH.

